1/*
  2 *  linux/arch/arm/lib/copy_from_user.S
  3 *
  4 *  Author:	Nicolas Pitre
  5 *  Created:	Sep 29, 2005
  6 *  Copyright:	MontaVista Software, Inc.
  7 *
  8 *  This program is free software; you can redistribute it and/or modify
  9 *  it under the terms of the GNU General Public License version 2 as
 10 *  published by the Free Software Foundation.
 11 */
 12
 13#include <linux/linkage.h>
 14#include <asm/assembler.h>
 
 15
 16/*
 17 * Prototype:
 18 *
 19 *	size_t __copy_from_user(void *to, const void *from, size_t n)
 20 *
 21 * Purpose:
 22 *
 23 *	copy a block to kernel memory from user memory
 24 *
 25 * Params:
 26 *
 27 *	to = kernel memory
 28 *	from = user memory
 29 *	n = number of bytes to copy
 30 *
 31 * Return value:
 32 *
 33 *	Number of bytes NOT copied.
 34 */
 35
 36#ifndef CONFIG_THUMB2_KERNEL
 37#define LDR1W_SHIFT	0
 38#else
 39#define LDR1W_SHIFT	1
 40#endif
 41#define STR1W_SHIFT	0
 42
 43	.macro ldr1w ptr reg abort
 44	ldrusr	\reg, \ptr, 4, abort=\abort
 45	.endm
 46
 47	.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
 48	ldr1w \ptr, \reg1, \abort
 49	ldr1w \ptr, \reg2, \abort
 50	ldr1w \ptr, \reg3, \abort
 51	ldr1w \ptr, \reg4, \abort
 52	.endm
 53
 54	.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
 55	ldr4w \ptr, \reg1, \reg2, \reg3, \reg4, \abort
 56	ldr4w \ptr, \reg5, \reg6, \reg7, \reg8, \abort
 57	.endm
 58
 59	.macro ldr1b ptr reg cond=al abort
 60	ldrusr	\reg, \ptr, 1, \cond, abort=\abort
 61	.endm
 62
 63	.macro str1w ptr reg abort
 64	W(str) \reg, [\ptr], #4
 65	.endm
 66
 67	.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
 68	stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
 69	.endm
 70
 71	.macro str1b ptr reg cond=al abort
 72	str\cond\()b \reg, [\ptr], #1
 73	.endm
 74
 75	.macro enter reg1 reg2
 76	mov	r3, #0
 77	stmdb	sp!, {r0, r2, r3, \reg1, \reg2}
 78	.endm
 79
 
 
 
 
 80	.macro exit reg1 reg2
 81	add	sp, sp, #8
 82	ldmfd	sp!, {r0, \reg1, \reg2}
 83	.endm
 84
 85	.text
 86
 87ENTRY(__copy_from_user)
 88
 89#include "copy_template.S"
 90
 91ENDPROC(__copy_from_user)
 92
 93	.pushsection .fixup,"ax"
 94	.align 0
 95	copy_abort_preamble
 96	ldmfd	sp!, {r1, r2}
 97	sub	r3, r0, r1
 98	rsb	r1, r3, r2
 99	str	r1, [sp]
100	bl	__memzero
101	ldr	r0, [sp], #4
102	copy_abort_end
103	.popsection
104

  1/*
  2 *  linux/arch/arm/lib/copy_from_user.S
  3 *
  4 *  Author:	Nicolas Pitre
  5 *  Created:	Sep 29, 2005
  6 *  Copyright:	MontaVista Software, Inc.
  7 *
  8 *  This program is free software; you can redistribute it and/or modify
  9 *  it under the terms of the GNU General Public License version 2 as
 10 *  published by the Free Software Foundation.
 11 */
 12
 13#include <linux/linkage.h>
 14#include <asm/assembler.h>
 15#include <asm/unwind.h>
 16
 17/*
 18 * Prototype:
 19 *
 20 *	size_t arm_copy_from_user(void *to, const void *from, size_t n)
 21 *
 22 * Purpose:
 23 *
 24 *	copy a block to kernel memory from user memory
 25 *
 26 * Params:
 27 *
 28 *	to = kernel memory
 29 *	from = user memory
 30 *	n = number of bytes to copy
 31 *
 32 * Return value:
 33 *
 34 *	Number of bytes NOT copied.
 35 */
 36
 37#ifndef CONFIG_THUMB2_KERNEL
 38#define LDR1W_SHIFT	0
 39#else
 40#define LDR1W_SHIFT	1
 41#endif
 42#define STR1W_SHIFT	0
 43
 44	.macro ldr1w ptr reg abort
 45	ldrusr	\reg, \ptr, 4, abort=\abort
 46	.endm
 47
 48	.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
 49	ldr1w \ptr, \reg1, \abort
 50	ldr1w \ptr, \reg2, \abort
 51	ldr1w \ptr, \reg3, \abort
 52	ldr1w \ptr, \reg4, \abort
 53	.endm
 54
 55	.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
 56	ldr4w \ptr, \reg1, \reg2, \reg3, \reg4, \abort
 57	ldr4w \ptr, \reg5, \reg6, \reg7, \reg8, \abort
 58	.endm
 59
 60	.macro ldr1b ptr reg cond=al abort
 61	ldrusr	\reg, \ptr, 1, \cond, abort=\abort
 62	.endm
 63
 64	.macro str1w ptr reg abort
 65	W(str) \reg, [\ptr], #4
 66	.endm
 67
 68	.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
 69	stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
 70	.endm
 71
 72	.macro str1b ptr reg cond=al abort
 73	str\cond\()b \reg, [\ptr], #1
 74	.endm
 75
 76	.macro enter reg1 reg2
 77	mov	r3, #0
 78	stmdb	sp!, {r0, r2, r3, \reg1, \reg2}
 79	.endm
 80
 81	.macro usave reg1 reg2
 82	UNWIND(	.save {r0, r2, r3, \reg1, \reg2}	)
 83	.endm
 84
 85	.macro exit reg1 reg2
 86	add	sp, sp, #8
 87	ldmfd	sp!, {r0, \reg1, \reg2}
 88	.endm
 89
 90	.text
 91
 92ENTRY(arm_copy_from_user)
 93
 94#include "copy_template.S"
 95
 96ENDPROC(arm_copy_from_user)
 97
 98	.pushsection .fixup,"ax"
 99	.align 0
100	copy_abort_preamble
101	ldmfd	sp!, {r1, r2}
102	sub	r3, r0, r1
103	rsb	r1, r3, r2
104	str	r1, [sp]
105	bl	__memzero
106	ldr	r0, [sp], #4
107	copy_abort_end
108	.popsection
109